[PE] 1 n Poss. Mine, belonging to me, for me, by me (singular, a-form; Gram. 9.11). [PCP na(a)ku] Naʻu ka puaʻa. Give me the pig.
[LA] 1 Pers. pron. An oblique case (auipaewa) of au, first person singular of the pronouns. For me; belonging to me; mine. Gram. § 124.
This is not proper English. "I have gotten" or "I got" the tip would work. It has sort of become colloquial to say "I've got the tip," but it would be better, perhaps, to say "I got the tip." "I got the tip" can mean "I will pay the tip", or it could mean "I already paid the tip."